Zinc-furnace



(No Model.)

0. LUMAGHI', ZINC PURNCE.

No. 483,934 Patented Oct. 4,j 1892.

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UNITED STATES PATENT Orrrcn.

OCTAVIUS LUMA-GHI, OF ST. LOUIS, MISSOURI.

z|Nc-FURNAoE.

SPECIFICATION formingpart of Letters Patent No. 483,934, dated October4:, 1892.

Application filed November 10, 1891- Serial No. 411,462. (No model.)

To all whom it may concern,.-

Be it known that I, Ocrnvrcs LUMAGHI, of the city of St. Louis, in theState of Missouri, have invented a certain new and useful Improvement inZinc-Furnaces, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification.

This is a substitute for the bags used for recovering the oxide from thefumes escaping from reducing furnaces or retorts, the object being tosubstitute a safe and easy way for collecting the fumes on shelves, and,if preferred, in dust-pans placed therein, so as to avoid all contactwith the dust that is necessarily raised in collecting this materialfrom bags, the oxides from these fumes being liable to contain lead andarsenic, so that the health of the operators is very seriously in jured.

The invention consists 'of a furnace having a devious passage for thecirculation of the fumes, intercepted by many deflectors and connectedto an inclosure which receives the fumes from the retorts. The passageleads from the inclosure to the downtake-liue, then through thehorizontal flue or iiues into the lower end of the uptake-flue, andthence out the chimney. The uptake-flue being made of the bestconductive. material-such as sheetiron--and being located as near asconvenient to the front of the furnace, while the rest of the apparatusis made of less conductive material-such as lumber or brickwork-andlocated farther from the furnace, the heat radiated from the furnace ispromptly transmitted to the heated air and fumes in the up? take-lineand their volume so increased that an ascensional force is set in motionto pro-4 l is the furnace, having retorts 2. The furnace formsone wallor part of one wall of a fume-chamber 3, the mouths 2 of the retortsdischarging the metallic fumes, dmc., into the chamber. The chamber hasa horizontal partition or iioor 4, separating the lower part of thechamber from the upper part 3a. v

5 .is a passageway leading from the lower part of the chamber to theupper part 3a.

6 is the downtake-ue, whose upper end is open to the upper part 3? ofthe chamber, so that the fumes descend from the upper chamber 3a downthe downtake.

7 is the horizontal fine or receiving-box, connecting the lower end ofthe downtakeflue to the lower end of the uptake-due S, ending in achimney 9. The uptake-due is near to the furnace,while the downtake-flueis distant `from the furnace, and thus the heat of the furnace producesthe current in the due. If the fumes were allowed to pass through thetlues Without any obstruction, the metal sublimate would be carried outthrough the chimney and so wasted without some other means were providedto recover it. In order to arrest the sublimate, I place deflectors inthe iiue. These may be of any suitable form and arrangement; but I haveadopted deflectors whose construction will now be described.

l0 is a plate adapted to fit the inside of the flue, except that oneside is cut away at 11, leaving a passage through which the fumes pass.

lOa is a plate formed like the plate l0 and connected therewith by a barl2. Upon the plate 10iL is a standing frame 13, adapted to supportanother deiiector by the bearing of its lower plate IO upon it. Thus thevertical flues may be iilled or partly lled with the deflectors, as seenin Fig. I, each deiiector composed of the two plates 10 and 10a,connected together by a bar l2 and having the standing frame 13. Thedelectors are stood one upon another, the lower one being supported on across-bar 14, passed through the ue. More or less of these deiectors areused according to circumstances. If it is found that there is waste atthe chimney, additional defiectors are put in the flue. By examinationof Figs. I and II it will be seen that the position of the plates lOvand10a are reversed, so that the aperture 11 comes on opposite sides TOOalternately, and thus the fumes have to take a devious track, impingingagainst each of the plates and 10a as 4they pass through. the iiue. Thiswill cause the metal oxides or sublimate to adhere to the plates, fromwhich it may be dislodged by concussion given to the flues at intervalsand Will fall into thev ing device or depositor by a forced or suctiondraft produced by a fan or other blower or suction device. (Not shown.)lisa pipefrom the chamber, into which the retorts discharge. This pipeis preferably carried down to a coil 16, having one or more turns, andconnected at the discharge end With an ascending iiue 17, havinggoose-neck connection with the interior of the depositing-'chamber 18.The depositing-chamber has vertical partitions 19 and 20, descendingfrom the top and ascendin g from the bottom alternately. The descendingpartitions stop short of the bottom and the ascending partitions shortof the top,

-so that the fumes alternately descend and ascend in the chamber. Inaddition to the vertical partitions are horizontal deflectors `2l,adapted to receive the impingement lof the fume-curren t, and thus delayits progress and cause the deposit of the sublim-ate or metal oxide uponthe dellectors. The deiiectors have a main horizontal part with -avert-ical flange 21a. Where the currentisdescending the anges extendupward, and Where the current is ascending the lflanges extend downward,so as to form a more effective obstacle to the current. The detlectorsyextend from opposite sides alternately of the Walls or the verticalpartitions, respectively, 1'9 2O of the depositing-chamber, as seen inFig. III, so that the current passes from side to side, as indicated bythe arrows.

At the proper time for the removal of the deposit access may be had tothe inside of the horizontal ilues by removing one of the sidesl of theapparatus that in'closes the iiues, and thus exposing the oxide4deposited upon the shelves, which may be easily removed, afterj whichthe side is replaced and the apparatus is again in Working order.

The oxide of zinc obtained by the combustion of the metal in the ore isnot homogeneous; but about one-half of itis exceedingly light and verydifficult to deposit. To counteract its buoyancy, ali mited amount ofsteam, just enough to dampen the oxide floating in the current, may beintroduced into the current. This Will cause the oxide to settle aboutas soon as the steam has time to condense into Water and Will afford acheaper and more satisfactory substitute for the bags now in use forthis purpose.

Heat from the furnace which would be otherwise Wasted is made availablefor starting and maintaining a steady current through the depositingchamber and flues. The fact that floating bodies are moreeasily'deposited when taken horizontally is made use of in the form ofapparatus shown in Fig. III.

This invention can be used to gather the fumes or smoke from any kind offurnace Whenever valuable matter is prese-nt.

I claim as my invention- 1. In combination with a flue f-or collectingfumes, a series of removable deflectors, each having two plates 10 10awith recesses upon the opposite sides, a bar connecting the plates, anda standing frame secured upon the plate 10n and adapted to supportanother deflec-tor, as set forth.

2. In a zinc-sublimin-g furnace, the combination of the retorts,apassage incommunication with the retorts and containing deiectorsadapted to receive deposits of the metallic oxide, a-nd an ascendingflue in connection with the discharging end of such passage and inproximity -to the retorts, so as to cause an upward current through suchfine, substantially as set forth.

3. The combination, in a zinc-sublimi-ng 9 furnace, yof the retorts, achamber for receiving the metallic fumes from the retorts, a passagecontaining detlectors, having an induction end open to said'chamber andan ascending flue at the eduction end in proximity to the retorts, forthe purpose set forth.

GCTAVIUS LUMAGHI.

Witnesses:

SAML. KNIGHT, J. M. MAROT.

ICO

